257 Roberts is a sweat caliber,,,, but,, have you priced and checked avalability of .257 components lately,,,,,, OUCH, and loaded ammo costs are seriously painful !!!!

The .257 Roberts is making a bit of a comeback, in a +P configuration, as the original round was kept to lower pressures for some of the older military rifles converted for it. Not as hot as the 25-06, but more solid performer than the lower pressure round.

But what I was suggesting here is the 6mm Remington, same round, smaller bullet, as I thought thew interest was a high performing 6mm round.

I'd done up a 03 action years ago in the 257 Roberts caliber and stepped it up sense it had a strong action and a bull barrel that was ,,,,MORE than capable of handling the extra pressures. It worked out very well as I remember.

I'm just sticking with standard calibers, the wild cat and odd ball stuff is getting out of reach for the average guy making the occasional trip to the range. Even some of the off the shelf stuff in things like the Weatherby calibers ,is ,,,OUTRAGEOUS!!!!!! If I'm not mistaken my hunting fishing bud told me the ammo for his 257 Weatherby was >70 bucks,,, Holy Shit!! What in Gods Green Earth,,,, could possibly make it so damn expensive,,,,,18 caret?????? Give Me A Break!

I'd done up a 03 action years ago in the 257 Roberts caliber and stepped it up sense it had a strong action and a bull barrel that was ,,,,MORE than capable of handling the extra pressures. It worked out very well as I remember.

I'm just sticking with standard calibers, the wild cat and odd ball stuff is getting out of reach for the average guy making the occasional trip to the range. Even some of the off the shelf stuff in things like the Weatherby calibers ,is ,,,OUTRAGEOUS!!!!!! If I'm not mistaken my hunting fishing bud told me the ammo for his 257 Weatherby was >70 bucks,,, Holy Shit!! What in Gods Green Earth,,,, could possibly make it so damn expensive,,,,,18 caret?????? Give Me A Break!

Grafs has 6mm Remington brass @ $25 for 50 pcs and Cheaper than Dirt has several loads of Hornady ammo for $22-24 a box. CTD is in Fort Worth Texas, and the 6mm Remington along with .243 Winchester seem to be very popular still in Texas.

They all seem to be pretty consistant over all with the milt ball sweedish being 100% consistant throughout. I measured 5 of each type and averaged out, but less than .002mm-.003mm seemed to be the max variance between all of them.

Is that what ya needed 1biggun?

SO THOISE ARE COMING IN AT .477" IF I DID THE CONERSION MATH OK.

THATS NOT THE .480 THAT E ALL THE SOURCES CLAIM. IM BETTTING THE SAMMI MAX IS .480" AN THE MANUFATURES ARE ALL UNDER IT.

THOSE ROUNDS ARE ALL GREAT I HAVE MOST OF THEM. 244 REM/6MM REM, 257 ROBERTS, 243 REM, 260 REM, 7MM-08, 7MM MAUSER ETC. IM CURRENTLY COLLECTING PARTS FOR A 6.5X55 SWEDE.

YOU GUYS ARE MISSING THE POINT. IM TRYING TO GET REAL WORLS ACTUAL MEASUREMENTS OF VARIOUS 6.5X55 BRASS AT THE BASE ( NOT THE RIM)

I AM BUILDING A WILD CAT THAT IS SIMULAR TO A 6MM BR BUT AROUND .200 LONGER. IT WILL HAVE A CASE LENGTH OF ABOUT 43MM WICH IS SHORTER THAN A 223 CASE IT WILL HOLD ABOUT 43 GRAINS OF WATER THAT IS ABOUT 10 MORE THAN A 7.62X39 IT WILL SHOOT A 100 GRAIN BULLET AT AROUND 3000 FPS +

IM DESIGNING IT TO FIT IN A AK MAG ( YEA IT WILL FIT A AR TO) IM TRYING TO GET AS MUCH POWER OUT OF A NON REBATED ROUND WITH A OPTIMUAL BULLET WEIGHT FOR CASE SIZE. I HAVE THREAD ON IT INT HE CALIBURE CONVERSION SECTION .

THOSE WHO ARE NOT AWARE OF THE 6MM BR IT IS A FACTORY LOADED ROUND AN HOLDS MORE THAN A FEW WORLD ACCURACY RECORDS IN BENCH REAST AN IS GREAT VARMINT ROUND. IM DOING A 6MM BR BOLT ACTION THAT WILL BE PRETTY CLOSE TO BENCH REST SPECS AN A IM WORKING ON A WILD CAT FROM THAT ROUND FOR THE AK WITH A MODED OR GALIL BOLT AN ANY OTHER RIFLE WITH A .470 OR SO BOLT FACE.

I ALRREADY HAVE A 22-250 243 , 260, 7MM-08, 358WIN AK IM TRYING TO GIVET MORE BANG OUT OF A STANDARD LENGTH MAG AN BE ABLE TO POSSABLY MAKE A BARREL THAT WILL BE A DIRECT FIT TO A MANY OF THE BARRELESS KITS OUT THERE. THIS ROUND WILL SMOKE THE DOORS OFF A 6.5 GRENDEL OR A 6MM AR TURBO OR AY OF THE CURRENT AR WONDER ROUNDS CURRENTLKY OUT THERE.

THE REAMER IS ON ORDER AN PAID FOR THE DIES ARE HERE. I DONT HAVE ANY 6.5 SWISS BRASS ON HAND TO MEASURE. IM TRYING TO FIGURE OUT IF THIS BRASS WOULD BE SUTIABLE FOR MY PURPOSES. RUNNING MY REAMER IN PAST NORMAL DEPTH CAUSES THE CHAMBER TO GET BIGGER AT THE BREACH THE FURTHER YOU GO IN.

MY REAMER IS .472 AT THE NORMAL DEPTH, THE TAPER OF MY REAMER ADDS .011" PER EVERY 1.190 INCES. SO GOING IN .200 EXTRA WILL OPEN THE CHAMBER UP AT THE CASE HEAD ABOUT .0015" OR SO . THAT WOULD MEAN I NEED A BRASS JUST UNDER .4735.

FOR THOSE WHO CAN DO MATH HOW MUCH OF A INCREASE WILL I GET PER .100" IF IM GETTING .O11 PER EVER 1.190" OF REAMER DEPTH?????

IM GUESING ITS ABOUT .001" PER EVERY .250" OF DEPTH INCREASE.

IF 6.5X55 BRASS IS REALLY ONLY .477 OR EVEN SMALLER ON US COMMERCIAL BRASS THEN I NEED TO GO A LOT, OR OPEN THE CASE HEAD AREA OF MY CHAMBER UP SLIGHTLY.

HERE IS SOME PICS OF THE INITAL ROUND IM DEVELOPING WITH A 100 GRAIN SOFT POINT FOR A 1-10 TWIST BARREL . SHOULD DO 3000 FPS APROX. WITH A 2.230 OAL . THERE IS GOING TO BE A 6.5 AN 30 CAL VERSION AS WELL. THE .30 VERSION SHOULD OUT PERFORM THE 7.62X39 BY A GOOD 200FPS WELL ABOVE A 30-30 ALSO.